[Feature Request] Deprecate the usage of search API with collector in ContextIndexSearcher

[sohami]

Is your feature request related to a problem? Please describe

In Lucene, IndexSearcher::search api which takes Collector (Ref: here) as input is marked for deprecation in favor of the one using CollectorManager (Ref: here. OpenSearch uses this interface to switch between concurrent and non-concurrent query path and overwrites it in the ContextIndexSearcher here. We should work towards removing the usage of that deprecated search API in OpenSearch and use the slice as a mechanism to control concurrent (slice > 1 || slice = 0) and non-concurrent path (i.e. slice =1). Similarly for the request type for which we don't prefer to execute concurrently we should enforce 1 slice for those requests to keep the behavior same. Apart from these, there is a pending functional gap in force termination capability which needs to be addressed:

• [Concurrent Segment Search] support forceTermination for terminate_after parameter #8371

Describe the solution you'd like

Remove the usage of deprecated search API in OpenSearch with CollectorManager based search API.

Related component

Search

Describe alternatives you've considered

N/A

Additional context

No response